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Message-ID: <dd4e5498-3e21-4ac1-b65a-fd132c2a7206@linux.ibm.com>
Date: Tue, 23 Jan 2024 14:17:00 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: alexs@...nel.org
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
Mel Gorman <mgorman@...e.de>,
Daniel Bristot de Oliveira
<bristot@...hat.com>,
Valentin Schneider <vschneid@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] sched/fair: narrow the sched_use_asym_prio checking
scenario
On 1/17/24 2:27 PM, alexs@...nel.org wrote:
> From: Alex Shi <alexs@...nel.org>
>
> Current function doesn't match it's comments, in fact, core_idle
> checking is only meaningful with non-SMT.
> So make the function right.
>
> Signed-off-by: Alex Shi <alexs@...nel.org>
> To: Valentin Schneider <vschneid@...hat.com>
> To: Vincent Guittot <vincent.guittot@...aro.org>
> To: Peter Zijlstra <peterz@...radead.org>
> To: Ingo Molnar <mingo@...hat.com>
> ---
> kernel/sched/fair.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 96163ab69ae0..0a321f639c79 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -9741,8 +9741,8 @@ group_type group_classify(unsigned int imbalance_pct,
> */
> static bool sched_use_asym_prio(struct sched_domain *sd, int cpu)
> {
> - return (!sched_smt_active()) ||
> - (sd->flags & SD_SHARE_CPUCAPACITY) || is_core_idle(cpu);
> + return (sd->flags & SD_SHARE_CPUCAPACITY) ||
> + (!sched_smt_active() && is_core_idle(cpu));
> }
This seems wrong. This would always return false for higher than SMT domains
if smt is active.
Was this meant to be sched_smt_active() && is_core_idle(cpu)?
>
> static inline bool _sched_asym(struct sched_domain *sd,
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